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Summary of Significant Accounting Policies - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jul. 31, 2022
Jul. 31, 2021
Jul. 31, 2020
Disaggregation of Revenue [Line Items]      
Service revenues and vehicle sales $ 3,500,921 $ 2,692,511 $ 2,205,583
Service revenues      
Disaggregation of Revenue [Line Items]      
Service revenues and vehicle sales 2,853,040 2,291,867 1,947,140
Service revenues | United States | United States      
Disaggregation of Revenue [Line Items]      
Service revenues and vehicle sales 2,533,165 2,017,504 1,714,724
Service revenues | International | International      
Disaggregation of Revenue [Line Items]      
Service revenues and vehicle sales 319,875 274,363 232,416
Vehicle sales      
Disaggregation of Revenue [Line Items]      
Service revenues and vehicle sales 647,881 400,644 258,443
Vehicle sales | United States | United States      
Disaggregation of Revenue [Line Items]      
Service revenues and vehicle sales 411,985 254,568 145,962
Vehicle sales | International | International      
Disaggregation of Revenue [Line Items]      
Service revenues and vehicle sales $ 235,896 $ 146,076 $ 112,481